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Full text of "Handbook Of Chemical Engineering - I"

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GRADING AND SCREENING
257
also have been proposed for revolving screens. For medium soft materials these devices may give some relief, but where the wear on the screen is rapid they would interfere with patching.
SILK CLOTH AND GAUZE SCREEN
Number of cloth	Mesh		Gauze			
	XX cloth •	XXX cloth	Number, gritz gauze	Equals cloth number	Number XXX gritz	Equals standard gritz
0000	18		14		14	16
000	23		16	0000	16	18
00	29	. . .	18		18	20
0	38		20		20	22
1	48		22	000	22	24
2	54		24		24	26
3	58		26		26	28
4	62		28	00	28	30
5	66		30		30	34
6	74		32		32	36
7	82	74	34		34	38
8	86	82	36		36	40
9	97	86	38		38	42
10	109	97	40	0	40	44
11	116	109	42		42	46
12	125	116	44		44	48
13	129	125	46	1	46	50
14	139	129	48		48	52
15	150	139	50	2	50	54
16	157	150	52		52	56
17	163	157	54	3	54	58
18	166	163	56		56	60
19	173		58	4	58	62
20	178		60		60	64
21	182		62		62	66
25	200		64	5	64	68
			66		66	70
			68		68	72
			70		70	
			72	6	72	
			80	7		
			86	8		
NOTE.—Cloth and gauze 40 in. wide.    Cloth in four weights: standard, X, XX and XXX.    Mesh is exact count per linear inch.
Screen-section Materials.—The materials most commonly used for making screen sections are: (1) Punched, drilled and cast plate with cored holes; (2) grizzly bars, some of the more common of the weights and dimensions of which are shown in Fig.
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